Pocket magneto



n. K. B'REWSTER.

POCKET MAGNETO, APPLICATIQN FILED JUNE 24., 1920.

2 SHEETS-SHEET I.

Patented 1m28, 1922.

R. Kl BREWSTER.

POCKET MAGNETO. I APPLlcATxoN HLED1uNE24, 1920.

2 SHEETS-SHEET 2.

Innung/Lr!! vIllanllgllllllllllllnlll,

Patented Nov. 28, 1922.

UNITED STATES PATENT OFFICE.

ROUSE K. BREWSTER, OF KINGSTON, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS,

T0 HERCULES EXPLOSIVES CORPORATION, OF WILMINGTON, DELAWARE, A COR- PORATION OF NEW YORK.

POCKET MAGNETO.

Application filed June 24,

T 0 all who/m, it ymay conce/rn- Be it known that I, Rouen K. BRnwsTER, a citizen of the United States, residing at Kingston, in the county of Ulster and State of New York, have invented new and useful Improvements in Pocket Magnetos, of which the following is a specification.

This invention relates to portable or pocket electric generators of the type employed for the purpose of firing mines, etc., which are known to the trade as pocket batteries, pocket generators or pocket dynamos.7

The objects of the invention are to provide a structure of the type set forth which shall consist of few parts, which shall not be liable to derangement of parts, and which shall be safe, certain. and otherwisc efficient in use, and which may be handled and operated with the utmost degree of efficiency by the unskilled laborer or oper` ator.

With the above and further objects in view, my invention consists in certain features of structure, combination and relation which will be more fully set forth hereinafter.

I have illustrated one embodiment of my invention in the accompanying drawings, wherein Figure 1 is a longitudinal vertical section through my improved generator.'

Figure 2 is a horizontal section taken on lines 2 2 of Figure 1.

Figure 3 is a transverse vertical section taken on lines 3--3 of Figure l.

Figure 4 is a transverse vertical section taken on lines 4-4 of Figure 1.

Figure 5 is a transverse vertical section taken on lines 5-5 of Figure 1.

Figure 6 is a transverse vertical section taken on lines 6-6 of Figure 1.

Figure 7 is an end elevation of the apparatus with the operating handle removed.

Referring to the drawings wherein similar numerals denote like parts throughout the several views:

1 denotes the casing of the machine which may be of any suitable shape or form, but which it is preferred to construct so that the apparatus may be readily carried in the pocket of the operator. In this casing are mounted magnets 2, which, as shown, .are preferably of the horseshoe type, and have 1920. Serial No. 891,468.

pole pieces 3. An armature 4 is mounted within the pole plates of the magnet 2. This armature carries the usual insulated wire windings, one end of which is connected to the armature metal or grounded to the machine, the other end making contact with the brush 5, whence the current induced is carried by any suitable means to binding post 6, this post being insulated from the machine.

The end plate 7 of the armature carries a pinion 8. This pinion meshes with a gear 9 mounted within the casing, which gear is actuated by means of a ratchet pinion 'l0 mounted therein.

The accelerator and actuating device 11 includes an externally-toothed gear 13, and is formed as a hollow drum having an endcap 14 s rewthreaded and locked thereon; the whole being mounted on the shaft 12 and free to turn thereon within certain limits. A coil spring 15 is positioned within the drum, one end of the spring being affixed to shaft 12, and the other end connected on the casing of the drum 11 by means of a fastening device such as the stud 16.

A cam yoke 17 is pivoted, as at 18, to the outer end of the drum casing 14. This cam yoke is formed with a flanged contact member 19 and is actuated through means of acam 20 which is aixed to shaft 12. A fixed contact member 21 surrounds shaft 12 and is secured to the wall of the casing. This fixed contact member is formed with bevellod contact arms 22. The fixed contact member is insulated by any of the usual means and is connected by suitable wiring to binding post 23. Shaft 12 and its associated members are rotated through means of a usual handle 24.

In the operation of the device the handle 24 is turned counter-clockwise. As the generator and its driving parts have considable inertia, the movement of handle 24 is not immediately communicated to the generator, but operates through half a turn to wind up the spring 15, and to break the contacts 19-22, by reason of the relative movement of shaft 12, carrying cam 20, and cover 14, carrying cam yoke 17. As the turning movement of the handle 24 is continued the spring 15 unwinds half a turn, closing @caracte 19-22 after the generator has been brought up to full speed by continued turning of the handle During current production the driving of the generator is exclusively7 by hendle, 24;.

Rotation of gear 13 results in actuationv of the armature 4L which Continues 'until the Contact on the cam yoke again engages the ixed Contact member which closes the ereut and permits the. current.- genereted by the. revolvingo'f the armature tobe clisharggecl into the line.

t. is apparent that zr devine is provided which is Certain and positive, in operation, and which generates a` uniform CurrentV no matter howI handledclaimsln combination with. ar` clynazlno7 having a spring drum for operating' the armature thereofa a. shaft on which seid. drum is rotetebly mounted, zr spring n seid drum eonnectng seid. shaft with the Wells oit the drum, e easing surrounding the dynamo and springt drum, e eem yoke pvoted at one end to the drum and having an elongated slot formed therein at its opposite end, seidV slot receiving seid shaft, said yoke have ing a. Contact member thereon, 2L Contact member attached to the easing, and a` eem secured eecentreelly to said. sha'r't and adeptecl to move the Contact member on said yoke, into und out of Contact with the oontact member on seid easing'.

In testimony whereof I have hereunto set my hand in presence of two subserbng Witnesses.

RO-USE K. BREVSTER. Witnesses:

CATHERINE A. BARRETT,

ARTHUR MAURER. 

